The following is the number of retirees receiving benefits from the State Teachers Retirement System of Ohio from 1991 until 2012.

a. Plot the data.
b. Determine the least squares trend equation. Use a linear equation.
c. Calculate the points for the years 2000 and 2010.
d. Estimate the number of retirees that will be receiving benefits in 2015. Does this seem like a reasonable estimate based on the historical data?
e. By how much has the number of retirees increased or decreased (per year) on average during theperiod?

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Year Service Year Service Year Service Year Service 1991 58,436 1997 72,601 2003 89,257 2008 106,099 1992 59,9941998 75,482 2004 92,574 2009 109,031 1993 61,515 199978,341 2005 95,843 2010 112,483 1994 63,182 2000 81,111 200699,248 2011 117,138 1995 67,9892001 83,918 2007 102,771 2012 112,136 1996 70,448 2002 86,666